2-3 new words per page?
I’m happy when I get less than 2-3 new (or forgotten
) words per sentence 
Yes, constantly, that’s why reading still takes a long time for me. But if I enjoy the books, then I don’t mind.
Also, I think I’m a slow reader in any language - I tend to read for 100% comprehension whatever text or language it may be, even in my mother tongue, so there’s that
I noticed that recently I have started dropping books where I either don’t like the writing style or the contents because I want to get something nice out of them now that they are still so hard to read - which often drives me to pick even harder books 
The Saikawa&Moe books are indeed a nice middle ground - they are not too hard, the number of unknown words is not too high, but they are still pretty interesting.
Not sure such a thing exists tbh… If you enjoy reading the book, and if you’re not annoyed by the slow speed, then why not!
(EDIT: Oh and when you’re looking for English language books for your students, I found the books by Astrid Lindgren amazingly approachable for English learners, and they are also beautiful stories. I’m currently reading The Brothers Lionheart with one of my Japanese language partners and although he is not very proficient in English he can get along quite ok most of the time.)
. That being said, he’s writing style is a good tradeoff between more elaborate grammar and being overly metaphorical, at least to me.
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I started making cheatsheets when it seems like there’s going to be a lot of characters, this is a snippet of my sheet for my current reading (おやすみ、夢なき子):